This is an inner layer from OS.SYSTEMS. Made of down and fleece, it's excellent as a drysuit inner layer when diving in cold water! The size is L, but I'm 170cm tall and weigh 80kg, and it has a comfortable, roomy fit. I've used it about 60 times over 6 years, so it shows some wear, but it's still in great condition. I believe I bought it for around 35,000 yen, so I think it's a good deal. Enjoy comfortable diving!